Display India Currency format using JavaScript

function intToFormat(nStr)
{
nStr += '';
x = nStr.split('.');
x1 = x[0];
x2 = x.length > 1 ? '.' + x[1] : '';
var rgx = /(\d+)(\d{3})/;
var z = 0;
var len = String(x1).length;
var num = parseInt((len/2)-1);

while (rgx.test(x1))
{
if(z > 0)
{
x1 = x1.replace(rgx, '$1' + ',' + '$2');
}
else
{
x1 = x1.replace(rgx, '$1' + ',' + '$2');
rgx = /(\d+)(\d{2})/;
}
z++;
num--;
if(num == 0)
{
break;
}
}
return x1 + x2;
}